I had my old Trinity X-Star Stock motor working perfectly, until it just seized while I was testing a battery on my bench.

I can only spin the armature a couple of degrees before it hits something and stops. I think I even see the shadow between the magnets on the can and the armature vanish, as it they were contacting each other.

It is a locked endball and I have no clue how to open the motor up to investigate. Any suggestions on how I can get this motor running again?